Composite filter and method of making the same

Details Composite filter and method of making the same Composite filter and method of making the same

B - Operations, Transporting

01

D

B01D 39/16 (2006.01) A47L 9/14 (2006.01) B01D 46/12 (2006.01)

Patent

CA 2439300

The invention refers to a composite filter for filtering a stream of ambient air comprising at least one non-prebonded upstream tier and one non-prebonded downstream tier, wherein the ration of absolute pore volume of upstream tier to downstream tier RAPV > 2, and the absolute projected fiber coverage of upstream tier and of downstream tier APFC > 95%. Further, the invention refers to a method of making such a composite filter comprising the steps of (a) laying down a filtration material onto a support to form the upstream non- prebonded tier, (b) depositing onto the upstream tier the downstream non- prebonded tier, and (c) bonding the tiers to form a composite filter having a unitary stratified structure.

L'invention concerne un filtre composite servant à filtrer un flux d'air ambiant, ledit filtre comprenant au moins un étage amont non prélié et au moins un étage aval non prélié. Le taux du volume de pores absolu de l'étage amont par rapport à l'étage aval (RAPV) est inférieur à 2, et la couverture de fibres projetées absolue de l'étage amont et de l'étage aval (APFC) est supérieure à 95 %. Par ailleurs, cette invention a trait à un procédé de fabrication d'un tel filtre composite consistant à (a) étendre une matière de filtration sur un support pour former l'étage amont non prélié, (b) à déposer sur l'étage amont l'étage aval non prélié, et (c) à lier les étages pour constituer un filtre composite doté d'une structure stratifiée unitaire.

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